Sorry, for some reason InterProcessSemaphoreMutex is not operating like the other Curator recipes. Please open a bug for this. It should be setting the data like other lock recipes.
-Jordan On February 25, 2015 at 2:34:19 PM, Jipeng Tan ([email protected]) wrote: Hi Jordan, The curator I am using is 2.7.0 Here is the snippet I used to acquire the lock: lock = new InterProcessSemaphoreMutex(zkClient, task); hasLock = lock.acquire(1, TimeUnit.SECONDS); hasLock is true after I call lock.acquire. What I observed after running above code there is no child under locks directory and only one file with no payload under leases directory. I am not quite sure why no seems no locks. Can you plz give me some suggestions? Thanks, Jipeng On Wed, Feb 25, 2015 at 11:20 AM, Jordan Zimmerman <[email protected]> wrote: Then you don’t have any locks it seems. On February 25, 2015 at 2:19:41 PM, Jipeng Tan ([email protected]) wrote: Hi Jordan, There is no child under locks directory: [zk: localhost:2181(CONNECTED) 155] get /blah/TaskLocks/task-1/locks cZxid = 0x1d301bc1ba ctime = Thu Feb 19 17:18:30 GMT-07:00 2015 mZxid = 0x1d301bc1ba mtime = Thu Feb 19 17:18:30 GMT-07:00 2015 pZxid = 0x1e00afb0ff cversion = 342702 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 0 numChildren = 0 Lease file have no payload: [zk: localhost:2181(CONNECTED) 6] get /indexer/33.8.717/active_80/locks/column-1/leases/_c_ff76b8f0-2fb8-44a8-9ebc-e3462f89ef94-lease-0001746006 cZxid = 0x1e0000ff93 ctime = Tue Feb 24 17:58:45 GMT-07:00 2015 mZxid = 0x1e0000ff93 mtime = Tue Feb 24 17:58:45 GMT-07:00 2015 pZxid = 0x1e0000ff93 cversion = 0 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x54a5fbd58ea0133 dataLength = 0 numChildren = 0 I also attached the code to create lock and acquire lock: private InterProcessSemaphoreMutex lock = null; .... private boolean acquireLock(final String taskName) throws TaskAcquisitionException { .... lock = new InterProcessSemaphoreMutex(zkClient, task); boolean hasLock = false; try { hasLock = lock.acquire(1, TimeUnit.SECONDS); } catch (Exception e) { throw new TaskAcquisitionException("Unable to acquire a lock for " + task, e); } return hasLock; } @Override public synchronized void stateChanged(final CuratorFramework client, final ConnectionState newState) { switch (newState) { case LOST: case SUSPENDED: try { if (lock != null) { if (lock.isAcquiredInThisProcess()) { LOGGER.info("Releasing lock."); lock.release(); LOGGER.info("Lock released."); } else { LOGGER.info("No Lock is owned. Nothing to be released."); } } } catch (Exception e) { LOGGER.error("Error releasing lock.", e); } break; case RECONNECTED: break; default: break; } } Thanks, Jipeng On Wed, Feb 25, 2015 at 7:06 AM, Jordan Zimmerman <[email protected]> wrote: You’re getting the data from the parent. It’s the lock/lease nodes that have the data. -Jordan On February 25, 2015 at 4:07:48 AM, Jipeng Tan ([email protected]) wrote: Thanks for the promptly response. Can I do this in zookeeper CLI? Here is my zookeeper directory structure I have: /blah/TaskLocks/task-1/ /blah/TaskLocks/task-2/ /blah/TaskLocks/task-3/ .... /blah/TaskLocks/task-n/ task-1...n is defined as the root of my task directory. I believe curator creates two more directories (locks and leases) under task-1...n I first try yo get payload from the child from locks directory. However, there is no data. [zk: localhost:2181(CONNECTED) 155] get /blah/TaskLocks/task-1/locks cZxid = 0x1d301bc1ba ctime = Thu Feb 19 17:18:30 GMT-07:00 2015 mZxid = 0x1d301bc1ba mtime = Thu Feb 19 17:18:30 GMT-07:00 2015 pZxid = 0x1e00afb0ff cversion = 342702 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 0 numChildren = 0 Did I do something wrong? Thanks, Jipeng On Tue, Feb 24, 2015 at 8:05 PM, Jordan Zimmerman <[email protected]> wrote: Unless you change it in the factory, the IP of the instance _is_ stored as the payload for the lock file. You can getChildren on the lock parent, sort them and get the payload of the first sorted child. -Jordan On February 24, 2015 at 10:58:16 PM, Jipeng Tan ([email protected]) wrote: Hi, We use InterProcessSemaphoreMutex to make sure certain machine only process certain Task. One issue I am currently facing is: sometimes a lease file for one Task presents on Zookeeper, however, there is no machine process that Task after zookeeper quorum is rebooted. Since we have hundreds of machines, it is quite hard to go over every machine's log to figure out which machines own the lease file. So I wonder if there is a better way to find the association of machines and lease files. Is that possible to add machines info (IP) to the Lock? Thanks, Jipeng
